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<h1>Organizing Code</h1>
<h2 class="subtitle">Notes</h2>

<h3>Exercise: File Handler Module</h3>
<p>
  If you'd like some practice creating files and modules, put all the <tt>handle_file</tt> functions into their own module named <tt>FileHandler</tt>, for example.
</p>
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          <div class="highlight"><pre><span class="kd">defmodule</span> <span class="nc">Servy.FileHandler</span> <span class="k">do</span>
  <span class="kd">def</span> <span class="n">handle_file</span><span class="p">({</span><span class="ss">:ok</span><span class="p">,</span> <span class="n">content</span><span class="p">},</span> <span class="n">conv</span><span class="p">)</span> <span class="k">do</span>
    <span class="p">%{</span> <span class="n">conv</span> <span class="p">|</span> <span class="ss">status</span><span class="p">:</span> <span class="mi">200</span><span class="p">,</span> <span class="ss">resp_body</span><span class="p">:</span> <span class="n">content</span> <span class="p">}</span>
  <span class="k">end</span>

  <span class="kd">def</span> <span class="n">handle_file</span><span class="p">({</span><span class="ss">:error</span><span class="p">,</span> <span class="ss">:enoent</span><span class="p">},</span> <span class="n">conv</span><span class="p">)</span> <span class="k">do</span>
    <span class="p">%{</span> <span class="n">conv</span> <span class="p">|</span> <span class="ss">status</span><span class="p">:</span> <span class="mi">404</span><span class="p">,</span> <span class="ss">resp_body</span><span class="p">:</span> <span class="s2">"File not found!"</span> <span class="p">}</span>
  <span class="k">end</span>

  <span class="kd">def</span> <span class="n">handle_file</span><span class="p">({</span><span class="ss">:error</span><span class="p">,</span> <span class="n">reason</span><span class="p">},</span> <span class="n">conv</span><span class="p">)</span> <span class="k">do</span>
    <span class="p">%{</span> <span class="n">conv</span> <span class="p">|</span> <span class="ss">status</span><span class="p">:</span> <span class="mi">500</span><span class="p">,</span> <span class="ss">resp_body</span><span class="p">:</span> <span class="s2">"File error: </span><span class="si">#{</span><span class="n">reason</span><span class="si">}</span><span class="s2">"</span> <span class="p">}</span>
  <span class="k">end</span>
<span class="k">end</span>
</pre></div>
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<p>
  You'll need to then import this new module in the 
    existing <tt>Handler</tt> module.
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          <div class="highlight"><pre><span class="kn">import</span> <span class="nc">Servy.FileHandler</span><span class="p">,</span> <span class="ss">only</span><span class="p">:</span> <span class="p">[</span><span class="ss">handle_file</span><span class="p">:</span> <span class="mi">2</span><span class="p">]</span>
</pre></div>
        </div>
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<h3>Import Options</h3>
<p>
By default, when you use <tt>import</tt> it imports all the module's functions and macros into the current namespace. As we did in the video, you can use
the <tt>only</tt> option to explicitly import specific functions:
</p>
<div class="highlight"><pre><span class="kn">import</span> <span class="nc">Servy.Plugins</span><span class="p">,</span> <span class="ss">only</span><span class="p">:</span> <span class="p">[</span><span class="ss">rewrite_path</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="ss">log</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="ss">track</span><span class="p">:</span> <span class="mi">1</span><span class="p">]</span>

<span class="kn">import</span> <span class="nc">Servy.Parser</span><span class="p">,</span> <span class="ss">only</span><span class="p">:</span> <span class="p">[</span><span class="ss">parse</span><span class="p">:</span> <span class="mi">1</span><span class="p">]</span>
</pre></div>
<p>
  Using <tt>only</tt> is optional, but it's recommended so 
  as to avoid importing all the functions into the current namespace and potentially ending up with name collisions. Conversely, there's a rarely used <tt>except</tt> option to import all the functions <em>except</em> those that are specified.
</p>
<p>
  For completeness sake, you might bump into two other variations worth noting:
</p>
<p></p>
<div class="highlight"><pre><span class="kn">import</span> <span class="nc">SomeModule</span><span class="p">,</span> <span class="ss">only</span><span class="p">:</span> <span class="ss">:functions</span>

<span class="kn">import</span> <span class="nc">SomeModule</span><span class="p">,</span> <span class="ss">only</span><span class="p">:</span> <span class="ss">:macros</span>
</pre></div>
<p>
  Using the <tt>:functions</tt> atom imports only functions whereas using the <tt>:macros</tt> atom only imports macros.
</p>

<h3>Alternate Way to Get Absolute Paths</h3>
<p>
  In the previous video we expanded the path to the <tt>pages</tt> directory relative to the directory of the current file (<tt>__DIR__</tt>) like so:
</p>
<div class="highlight"><pre><span class="na">@pages_path</span> <span class="nc">Path</span><span class="p">.</span><span class="n">expand</span><span class="p">(</span><span class="s2">"../../pages"</span><span class="p">,</span> <span class="bp">__DIR__</span><span class="p">)</span>
</pre></div>
<p>
  Now that we're running the application using <tt>iex -S mix</tt>, you can optionally expand the path using a slightly different approach, as follows:
</p>
<div class="highlight"><pre><span class="na">@pages_path</span> <span class="nc">Path</span><span class="p">.</span><span class="n">expand</span><span class="p">(</span><span class="s2">"pages"</span><span class="p">,</span> <span class="nc">File</span><span class="p">.</span><span class="n">cwd!</span><span class="p">)</span>
</pre></div>
<p>
  We've removed the <tt>../../</tt> part of the first argument and 
  called the <tt>File.cwd!</tt> function as the second argument. <tt>File.cwd!</tt> returns the current working directory. 
</p>
<p>
  But wait, you say, won't that vary depending on where we run the application? Yes, but mix <em>always</em> runs from the root project directory which is the top-level <tt>servy</tt> directory in our case. So calling <tt>File.cwd!</tt> <em>always</em> returns the top-level <tt>servy</tt> directory. And relative to that directory, the <tt>pages</tt> directory is just one level down.
</p>
<p>
  Kind of a neat trick!
</p>
<p>
  As an aside, this is the first time we've seen a function name ending with <tt>!</tt>. Generally speaking, this is a naming convention that conveys that the function will raise an exception if it fails. In particular, calling <tt>File.cwd!</tt> is the same as calling <tt>File.cwd</tt> but it raises an exception if for some reason there's a problem.
</p>

<h3>The Kernel Module</h3>
<p>
  Functions and macros defined in Elixir's 
  <a href="https://hexdocs.pm/elixir/Kernel.html" target="_blank">Kernel</a> module are automatically imported into every module for convenience. It's worth scanning through these functions and macros.
</p>

<h3>Code So Far</h3>
<p>
  The code for this video is in the
<code>organizing-code</code> directory found within the
  <tt>video-code</tt> directory of the <a href="https://s3.amazonaws.com/pragmaticstudio/courses/elixir/pragstudio-elixir-code.zip">code bundle</a>.
</p>



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      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/1">1. Introduction</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/1">Video</a><span class="time">1:56</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/2">Setup</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/2">2. Create Mix Project</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/3">Video</a><span class="time">8:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/4">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/3">3. High-Level Transformations</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/5">Video</a><span class="time">8:27</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/6">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/4">4. Parse Request Line</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/7">Video</a><span class="time">10:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/8">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/5">5. Route and Response</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/9">Video</a><span class="time">6:40</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/10">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/6">6. Function Clauses</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/11">Video</a><span class="time">6:28</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/12">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/7">7. Request Params and Status Codes</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/13">Video</a><span class="time">8:45</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/14">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/8">8. Rewrite Paths and Track 404s</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/15">Video</a><span class="time">9:31</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/16">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/9">9. Serve Static Files</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/17">Video</a><span class="time">11:27</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/18">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/10">10. Module Attributes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/19">Video</a><span class="time">3:00</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/20">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/11">11. Organizing Code</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/21">Video</a><span class="time">6:30</span></li>
            <li class="here"><a href="https://online.pragmaticstudio.com/courses/elixir/steps/22">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/12">12. Modeling With Structs</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/23">Video</a><span class="time">11:09</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/24">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/13">13. Handle POST Requests</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/25">Video</a><span class="time">10:32</span></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/14">14. Recursion</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/27">Video</a><span class="time">13:17</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/28">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/15">15. Slicing and Dicing with Enum</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/29">Video: Part 1</a><span class="time">10:25</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/30">Video: Part 2</a><span class="time">11:51</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/31">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/16">16. Comprehensions</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/32">Video</a><span class="time">11:15</span></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/17">17. A Peek At Phoenix</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/34">Video</a><span class="time">13:12</span></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/18">18. Test Automation</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/36">Video</a><span class="time">15:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/37">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/19">19. Rendering JSON</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/38">Video</a><span class="time">06:47</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/39">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/20">20. Web Server Sockets</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/40">Video</a><span class="time">19:11</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/41">Notes</a></li>
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      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/21">21. Concurrent, Isolated Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/42">Video: Part 1</a><span class="time">12:07</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/43">Video: Part 2</a><span class="time">10:21</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/44">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/22">22. Sending and Receiving Messages</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/45">Video</a><span class="time">19:38</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/46">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/23">23. Asynchronous Tasks</a>
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            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/47">Video</a><span class="time">20:19</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/48">Notes</a></li>
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        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/24">24. Stateful Server Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/49">Video: Part 1</a><span class="time">8:09</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/50">Video: Part 2</a><span class="time">11:55</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/51">Video: Part 3</a><span class="time">9:49</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/52">Video: Part 4</a><span class="time">8:59</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/53">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/25">25. Refactoring Toward GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/54">Video</a><span class="time">21:12</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/55">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/26">26. OTP GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/56">Video</a><span class="time">16:57</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/57">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/27">27. Another GenServer</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/58">Video</a><span class="time">9:00</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/59">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/28">28. Linking Processes</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/60">Video</a><span class="time">13:38</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/61">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/29">29. Fault Recovery with OTP Supervisors</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/62">Video: Part 1</a><span class="time">13:39</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/63">Video: Part 2</a><span class="time">6:13</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/64">Notes</a></li>
        </ul>
      </li>
      <li class="">
        <a href="https://online.pragmaticstudio.com/courses/elixir/modules/30">30. Final OTP Application</a>
        <ul>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/65">Video</a><span class="time">15:22</span></li>
            <li class=""><a href="https://online.pragmaticstudio.com/courses/elixir/steps/66">Notes</a></li>
            <li class="not-completable"><a href="https://online.pragmaticstudio.com/courses/elixir/next_steps">Next Steps</a></li>
            <li class="not-completable"><a href="https://online.pragmaticstudio.com/courses/elixir/evaluation">Evaluation</a></li>
        </ul>
      </li>
  </ul>
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